If, like me, you can't really afford expensive computer books, find a book in
your bookshop with good examples, download the example code and work through
the examples. Use a reference such as the W3C CSS technical recommendation. My
favourite is Sitepoint's CSS anthology

Libraries are another good option. When I moved to US, I was a bit
overhelmed by the steep book prices here. However, around 2 months
back, I found out about the public library and I became a big fan (I
even say that on my Facebook page, so it must be true ). My library
has a great internet page, allowing me to search books and put them on
hold online. I am trying to adopt this book workflow
<http://sachachua.com/wp/2009/02/11/book-workflow/> for book reading now.